Update adt_pull_request.yml

Author: DiegoGalante

adt_pull_request.yml

@@ -25,8 +25,7 @@ steps:
   displayName: 'Install sonarscanner'
   inputs:
     command: custom
-    custom: tool
-    arguments: 'dotnet tool install --global dotnet-sonarscanner'
+    arguments: 'dotnet tool install --global dotnet-sonarscanner --version 5.8.0'
 
 - task: DotNetCoreCLI@2
   displayName: Build